Generate UUID
Validate UUID
Recent UUIDs
No history yet
A UUID generator creates universally unique identifiers for databases, APIs, logs, distributed systems, and test data. UUID Generator Pro supports v1, v4, v5, and v7 formats, validates existing IDs, and keeps generation private by running entirely in your browser.
A UUID is useful when a record must be named before a central database has assigned its own numeric key. Client applications can prepare objects, background jobs can create trace IDs, and independent services can exchange references without first asking one shared server for the next value. This page focuses on practical UUID work: choosing a version, generating batches, checking pasted values, and exporting identifiers in formats that fit code reviews, fixtures, seed files, API tests, and database migrations.
The generator runs locally with browser APIs. Random UUIDs use cryptographic randomness where the browser provides it, v5 UUIDs are derived from a namespace and name, and v7 UUIDs combine a time component with random bytes so they sort more naturally in modern data stores. The tool does not ask you to create an account, upload a file, or send generated UUIDs to an application server for processing.
No history yet
UUID Generator Pro is a browser-based utility for creating identifiers at the moment you need them. Choose the UUID version, decide how many values to create, select the output style, and generate the list. The result appears on the page with copy controls and download options, so you can paste one ID into a migration, copy a batch into a fixture file, or export a list for a spreadsheet without installing a package.
UUID v4 is the safest everyday default because it is random and does not reveal time, host, or input data. UUID v5 is deterministic: with namespace DNS and the name api.uuid-generator.pro, the same input will always produce the same identifier, which is useful for repeatable imports and stable external references. UUID v7 is helpful when records are inserted at high volume and you want keys that broadly follow creation time, reducing the awkward indexing pattern caused by fully random identifiers.
Generated UUIDs, pasted validation values, namespaces, and export contents stay in your browser.
Export generated UUIDs as JSON, CSV, or plain text. Batch generation supports up to 1,000 UUIDs at once.
Validate any UUID format and detect its version. Supports dashes, braces, and raw hex formats.
example.com creates a repeatable UUID for that domain-style identifier.1 is best for a single API request or migration. A count such as 25 is useful for seed data, automated tests, and sample records.| Task | Input | Example output | Why it fits |
|---|---|---|---|
| Create a new order ID | Version v4, count 1, dashes | 9f1c2a6b-3b61-4c2d-9d8c-2f31f8a1b445 |
Random IDs are hard to guess and do not reveal creation time. |
| Generate seed records | Version v4, count 50, JSON export | {"uuids":["..."]} |
JSON drops neatly into fixtures and local test data. |
| Create a stable domain key | Version v5, DNS, example.com |
Same input returns the same UUID each time | Deterministic IDs make re-runs idempotent. |
| Index recent events | Version v7, count 10, plain text | Time-sortable UUID strings | Newer IDs sort close to insertion order in many storage engines. |
Generated using timestamp (date/time) and MAC address. Sortable by creation time. Best for sequential application logs.
Use case: Database entries that need chronological ordering
Pure random generation. Most commonly used. Extremely low collision probability. No timestamp or identifying information.
Use case: Default choice for most applications (web apps, APIs, databases)
Deterministic: same input always generates same UUID. Uses SHA-1 hash of namespace + name. Supports DNS, URL, OID, X.500 DN namespaces.
Use case: Reproducible IDs from email addresses or domain names
Modern sortable format using Unix timestamp. Better for distributed systems and databases. More collision-resistant than v1 with time-ordering benefits.
Use case: Modern databases requiring sortable IDs (Postgres, MongoDB)
UUIDs are a good fit when systems need to create identifiers independently. They are common in REST resources, GraphQL node IDs, event logs, message queues, background jobs, file metadata, audit records, import pipelines, feature-flag entities, payment reconciliation tables, and integration tests. A UUID does not guarantee business meaning; it gives you a compact unique reference that different parts of a system can safely pass around.
For production databases, store UUIDs in a native UUID type where the database supports one. In PostgreSQL, that usually means a uuid column rather than a longer text column. In APIs, keep the canonical dashed representation unless a consuming system documents a different format. When generating IDs for public URLs, remember that uniqueness is not the same as authorisation: users should still be authorised before a UUID-backed resource is returned.
For deeper background, read the site guides on UUID versions 1, 4, 5, and 7, using UUIDs in distributed systems, and GUID and UUID compatibility. The blog index collects all articles, while the about page explains how this browser utility is maintained.
A UUID (Universally Unique Identifier) is a 128-bit unique identifier defined by RFC 4122. It's represented as a 36-character string with hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are used to uniquely identify objects, database records, and transactions across distributed systems.
GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are the same standard (RFC 4122). Microsoft uses GUID in Windows and .NET. UUID is the open standard name. Both terms refer to identical functionality and can be used interchangeably.
v4 (Random): Use by default. Best for most applications. Recommended for 99% of use cases.
v1 (Time-based): Use when you need temporal ordering and the MAC address won't compromise privacy.
v5 (SHA-1 Hash): Use when you need reproducible IDs from existing data (emails, domain names).
v7 (Unix Epoch): Use in modern databases that require sortable IDs with Unix timestamp prefixes.
Yes, absolutely. This generator uses the Web Cryptography API (crypto.getRandomValues()), which provides cryptographically secure randomness in all modern browsers. All UUID generation happens client-side — nothing is transmitted to servers. Your data never leaves your device.
Yes. After generating UUIDs, use the Download button to export in your preferred format: JSON (structured data), CSV (spreadsheet-compatible), or plain text (one UUID per line). You can also copy individual UUIDs or all at once.
You can generate up to 1,000 UUIDs in a single batch. This is useful for bulk operations or populating databases. All generation happens instantly in your browser.
UUIDs are generated in your browser. The history panel may keep recent values in localStorage on your device so you can copy them again during the same workflow. They are not uploaded to a UUID Generator Pro application server.
No. UUIDs are identifiers, not passwords or access tokens. A random v4 UUID is difficult to guess, but your application should still check permissions before returning private data for any UUID in a URL or API request.
UUID v7 includes timestamp information, so newly created values tend to sort in creation order. That can help database indexes and event logs while still keeping enough random data for distributed generation.
Yes, but choose storage and indexing carefully. Native UUID column types are usually preferable to text columns. If insert locality matters, consider v7 or another ordered identifier strategy rather than random v4 values.
The validator checks the expected hexadecimal UUID shape with optional separators and reports the version nibble when it can. It is a format check, not proof that a UUID exists in a particular database.